如何重叠图像并将其存储在新图像对象中

Question

I have two images,now i want to overlay the images,such that the other image appears on center or left corner of the other image,and then when finally both the images are overlayed i can store it in another new image object,and i want to all this in code behind only not xaml,how to do this?

if (((Grid)sender).Children.Count > 0)
{
    gridBackground = (ImageBrush)(((Grid)sender).Background);
    gridBackImage = new System.Windows.Controls.Image();
    gridBackImage.Source = gridBackground.ImageSource;
}

System.Windows.Controls.Image imgRejectIcon;
if (((Grid)sender).Children.Count > 0)
{
    imgRejectIcon = (System.Windows.Controls.Image)(((Grid)sender).Children[0]);    
}

Now i want to merge gridBackImage and imgRejection and store it in new image object

Answer 1

You can arrange your two Image s in any way that you want and I'll leave that code for you to do (it'd much simpler to do in XAML). In WPF, all UI controls extend the Visual class . This is very useful for making BitmapImage s from UI controls, when used with the RenderTargetBitmap.Render method .

First, arrange your two Image controls into a Grid , or other container control, and then you can pass the container control to the RenderTargetBitmap.Render method and create an Image something like this:

RenderTargetBitmap renderTargetBitmap = 
    new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
renderTargetBitmap.Render(yourContainerControl); 
PngBitmapEncoder pngImage = new PngBitmapEncoder();
pngImage.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (Stream fileStream = File.Create(filePath))
{
    pngImage.Save(fileStream);
}